Comes commercii; or, The trader's companion. Containing I. An exact and useful table, shewing the value of any quantity of any commodity ... II. A table calculated for universal use, which use is shewn in the solution of questions ... III. The manner of casting up dimensions in general ... IV. The several customs used by surveyors and measurers ... V. Instructions for entering goods at the custom-house ... VI. Concerning water-side business ... VII. Practical rules concerning freight ... VIII. Rules concerning insuring ships, merchandize, and houses ... To which is added, a supplement concerning simple and compound interest ..